Update github_pull_request table to use GraphQL API

[graza-io]

Is your feature request related to a problem? Please describe.
I'd like to use the GraphQL API when querying the table

Describe the solution you'd like
Update the table to use the GraphQL API

Describe alternatives you've considered
n/a

Additional context
For any fields that have paging, consider implementing that field as another table to avoid excess API calls (as per https://steampipe.io/docs/develop/plugin-release-checklist#data-ingestion).

New columns

• active_lock_reason
• author
• checks_url
• closed
• created_via_email
• editor
• head_ref_oid
• includes_created_edit
• is_cross_repository
• is_read_by_user
• last_edited_at
• merged_by
• milestone
• permalink
• published_at
• revert_url
• review_decision
• base_ref
• head_ref
• merge_commit
• suggested_reviewers
• can_apply_suggestion
• can_close
• can_delete_head_ref
• can_disable_auto_merge
• can_edit_files
• can_enable_auto_merge
• can_merge_as_admin
• can_react
• can_reopen
• can_subscribe
• can_update
• can_update_branch
• did_author
• cannot_update_reasons
• subscription
• assignees_total_count
• labels_total_count
• commits_total_count
• review_requests_total_count
• reviews_total_count

Renamed columns

• issue_number => number
• comments => total_comments_count
• draft => is_draft
• base_ref => base_ref_name
• head_ref => head_ref_name
• html_url => url
• rebaseable => can_be_rebased

Removed columns

• rebaseable - SEE NOTE IN COMMENT BELOW
• author_login - obtain from author column json
• assignee_logins - has a count now, is pageable - build a new table?
• comments_url - rest api endpoint.
• commits_url - rest api endpoint.
• diff_url - not returned in GraphQL api.
• issue_url - not returned in GraphQL api.
• labels - has a count now, is pageable - build a new table?
• mergeable_state - now merged into mergeable
• merged_by_login - obtain from merged_by column json
• merge_commit_sha - obtain from merged_commit column json
• milestone_id - obtain from milestone column json
• milestone_title - obtain from milestone column json
• patch_url - not returned in GraphQL api
• requested_reviewer_logins - has a count now, is pageable - build a new table?
• review_comments
• review_comments_url
• review_comment_url
• statuses_url
• tags

Columns with data changes

• mergeable - was formally a bool, now is a string (CONFLICTING, MERGEABLE, UNKNOWN)

[graza-io]

Note: canBeRebased needs a custom header object setting on the underlying httpClient as per : https://docs.github.com/en/graphql/overview/schema-previews#merge-info-preview-more-detailed-information-about-a-pull-requests-merge-state-preview

Removed for now, will look to re-add this later...

[graza-io]

dbaa367 on graphql-dev branch